CN102824761A - Vacuum desorption method for desorbing gas from volatile solution - Google Patents
Vacuum desorption method for desorbing gas from volatile solution Download PDFInfo
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Abstract
The invention provides a vacuum desorption method. The method comprises the following steps of (a) introducing a volatile solution with relatively high amount of to-be-desorbed gas dissolved therein (abbreviated rich solution) into a vacuum container, to form a liquid phase region and a gas phase region; (b) making a gas pressure in the vacuum container reduced to lower than that of the saturated vapour pressure of the introduced volatile solution, so that partial solvent of the introduced volatile solution evaporates into solvent vapour; the to-be-desorbed gas of the introduced volatile solution escapes to form a free gas; and the above two gases mix and enter into the gas phase region; and then, extracting a mixture composed of the solvent vapour and the free gas from the gas phase region; (c) pressurizing the mixture extracted from the gas phase region, discharging into a sealed loop, condensing in the sealed loop, keeping a work pressure of the sealed loop being higher than the saturated vapour pressure but lower than an atmospheric pressure, so that the solvent vapour in the mixture is condensed into a condensate liquid and emits heat, then transferring the heat to the rich solution from the sealed loop, and simultaneously pumping out the free gas and the condensate liquid from the sealed loop.
Description
Technical field
The vacuum desorption technology of desorption gas from volatile solvent soln; Can be used for water treatment field like vacuum outgas from water, deaeration in condenser, vacuum removing carbon dioxide and other escaping gases; The vacuum desorption technology that also can be used for the environmental protection field can also be used for chemical process as from natural gas, separate the removal hydrogen sulfide gas with the organic amine adsorption and desorption as from flue gas, reclaiming sulfur dioxide, carbon dioxide with organic amine.
Technical background
The centrifugal vacuum degasser that the Chinese invention patent application of submitting on March 9th, 2,010 201010120927.0 relates to is a kind of equipment of the novel evacuated degassing.Adopt this technology just not need tall and big vacuum column, equipment volume can reduce significantly, and degasification process receives the influence of foam hardly, is used for lubricating oil, hydraulic oil, when the transformer wet goods is difficult for the liquid degassing of volatilization, and effect is fine.This application is introduced as follows in detail at present:
Embodiment shown in accompanying drawing 2 is a degasser structure chart that adopts the embodiment of the optimization that immersion oil motor 150 drives rotary wheel device 104, and the application of its optimization is the degassing dehydration of insulating oil, can certainly be used for some other suitable occasion.Below be that example describes with the insulating oil.The degasser upper end is pipeline opening or the bleeding point 400 that connects vavuum pump, and the side is liquid outlet or liquid pumping hole 300, and the bottom is oil-in or inlet 200.After vavuum pump starts, need oil-in 200 entering of the insulating oil of processing from the equipment bottom, the gap between the shell of process immersion oil motor 150 and the housing 100 of degassing equipment flows up into the gas-liquid mixed flash zone of rotary wheel device 104.Under the effect of the high vacuum in rotary wheel device, the gas rapid evaporation is come out.Under the action of the centrifugal, the liquid of gas-liquid mixed flash zone is side flow or throw away radially outward, arrives centrifugal and sees the back, district off and adopt the principle of centrifugal pump that oil is seen off.The gas then perforate of the gas sidewall through the gas-liquid mixed flash zone upwards gets into the gas centrifugation purifying area.In the gas centrifugation purifying area, the minor amount of oil of carrying in the gas drops in and is thrown to the outside under the action of centrifugal force, converges to discharge through the gap of rotary wheel device between degasser spiral case 107 and other liquid.The fluid of liquid outlet has certain pressure, can pass through the pipe valve system and be connected with filter.And purified gas by the road system be connected to vacuum pump inlet, thereby realize accomplishing gas-liquid separation apace under the high vacuum condition.
As shown in Figure 1, traditional vacuum degasser comprises a housing 100, inlet 200, a bleeding point 400 and a liquid outlet 300.
As shown in Figure 2, said housing 100 limits a hollow cavity, and this hollow cavity is covered and sealed by a loam cake 130.The power set 150 of motor and so on are installed among inner chamber, and these power set are fixed on the housing 100.
Said power set 150 have an output shaft 102, and this output shaft has a rotation 155.On output shaft 102, fixedly mounting a rotary wheel device 104, this rotary wheel device 104 is positioned among the said hollow cavity.Said rotary wheel device 104 has two sidewalls 106 and 108 that radially extend, and among these two sidewalls, sidewall 106 contiguous bleeding points 400 are referred to as the gas sidewall; And another sidewall 108 is referred to as the liquid sidewall.
From liquid sidewall 108, upwards stretch out some concentric annular plates 112, from gas sidewall 106, stretch out some concentric annular plates 111 downwards.Annular plate 111 and 112 cover is each other inserted, but does not touch the sidewall 106 and 108 on opposite.
On gas side plate 106, have some through holes 116, bleeding point 400 is linked up with the gas-liquid channel that gas sidewall 106, liquid sidewall 108 and annular plate 111,112 limit mutually.
Above gas sidewall 106, done some blades 122, these blades apply circular motion to gas between the blade or gas-liquid mixed on the one hand, also for these gases or gas-liquid mixture the radial flow circulation passage are provided on the other hand.
The operation principle of centrifugal degasser of the present invention is described now.Inject liquid through inlet 200 to the inner chamber of housing 100, contain dissolved gases, moisture content and other volatile substances in the liquid this moment.Inner chamber by 400 pairs of housings 100 of bleeding point vacuumizes, and starts 104 rotations of motor 150 drive rotary wheel device.Under the inner chamber vacuum action; Said dissolved gas and moisture and volatile substances begin to form bubble; These bubbles get into rotary wheel device 104 with liquid along direction shown in the arrow 101, promptly get in the gas-liquid channel that gas sidewall 106, liquid sidewall 108 and annular plate 111 and 112 limited.
The gas-liquid mixture that gets in the gas-liquid channel obtains rotary speed under the drive of rotary wheel device 104; Under the strong effect of centrifugal force; Gas-liquid mixture quickens to be separated into gas and liquid, and this is because fluid density is more much bigger than gas, particularly all the more so under high vacuum environment.
Therefore liquid just passes through the zigzag path that constitutes between ring-type 111 and 112 and flows radially outward and assemble (shown in arrow 105); And the gas collection space 118 of the air accumulation of deviating from rotary wheel device 104, gas more thus the through hole on gas sidewall 106 116 along arrow 103 directions rows to bleeding point 400.Thus, liquid constantly outgases, and the gas of deviating from is constantly extracted out from the inner chamber of housing 100.
The gas that via through holes 116 is seen off from rotary wheel device 104 possibly still can carried liquid secretly more or less, and the gas-liquid mixture here rotates under the drive of blade 122, is further centrifugalized.
Constantly liquid separated should in time be taken these liquid away radially from wherein being thrown to the collecting tank 107 of housing 100 inwalls in rotary wheel device 104.For this reason,, make a volute shape at the position of housing 100 around rotary wheel device 104, ring-type collecting tank 107 just, collecting tank is connected with liquid outlet 300.
Fig. 4 illustrates another embodiment of the present invention, is with the embodiment difference shown in Fig. 2 and 3, has replaced the concentric annular plate 111 and 112 among Fig. 2 and Fig. 3 with bolt, post 126.
Fig. 5 shows another embodiment of the present invention; Be with Fig. 2 and Fig. 3 difference; Here replace the concentric annular plate 111 and 112 among Fig. 2 and 3 with blade 128, with concentric conical surface plate 129 reach therebetween gap 116 ' replaced Fig. 2 and Fig. 3 gas side plate 106 and on through hole 116.
Fig. 6 illustrates an embodiment more of the present invention, has replaced the concentric annular plate 111 and 112 shown in Fig. 2 and Fig. 3 with spiral form plate 128 here.
Among the above-mentioned rotary wheel device embodiment, centrifugal is seen the radial outside that the district is positioned at the gas-liquid mixed flash zone off, and the gas centrifugation purifying area is positioned at the side, top of gas-liquid mixed flash zone.The structure that a kind of in addition scheme is a rotary wheel device does, gas centrifugation purifying area, gas-liquid mixed flash zone, centrifugal are seen the district off and be layout from inside to outside radially, because of the structural principle of each subregion then is identical, do not remake detailed description at this.
Certainly, the structure of gas-liquid mixed flash zone can produce bigger influence to work.According to different application conditions, can be optimized.For example under the not serious situation of frothing, in order to improve the effect that the degassing separates, accompanying drawing 2 and the rotary wheel device gas-liquid mixed flash zone shown in the accompanying drawing 3 are designed to that liquid falls step by step, separated structures step by step in centrifugal field.Rotary wheel device gas-liquid mixed flash zone shown in the accompanying drawing 4 is designed with many cylinders, and the gas-liquid mixed flash zone flow channel is more unobstructed generally, can adapt to the more relatively application scenario of foam.Under the too much situation of the gas that liquid produces, particularly under the too much situation of foam, can this zone design be become the structure similar with centrifugal pump impeller, with the speed of accelerating liquid discharge.In a word; As long as can realize to the liquid transfer energy, make the effect of liquid evaporation separation and can adapt to practical working situation; The variation of the linear structure of gas-liquid mixed flash zone can be described as inexhaustible; Continuously or be interrupted, on regular or irregular, the blade perforate or not perforate can, even filler that can the placing porous crack.The concrete structure of gas-liquid mixed flash zone here can not be enumerated out fully.
Evaporate isolated gas and get into the gas centrifugation purifying area.The gas centrifugation purifying area is to preventing that liquid from getting into vavuum pump from vacuum lead and playing an important role.With shown in the accompanying drawing 3, the gas after the separation is that the rotating vane of one carries out further gas-liquid separation through one group with rotary wheel device also like accompanying drawing 2, can guarantee like this from vacuum chamber flows to the gas of vavuum pump, to contain liquid hardly.The blade of gas centrifugation purifying area also can have a lot of shapes, but prismatic blade is the most simple and practical.The quantity of blade is also the amount doesn't matter, but quantity cross that I haven't seen you for ages and reduce gas-liquid separation effect, quantity is crossed can increase the weight of rotary wheel device at most and influence the smooth and easy of gas and is flowed.In general, the optional 3-40 sheet of blade quantity is preferably the 6-16 sheet.
Above-mentioned see the rotary wheel device structure that district, gas centrifugation purifying area form off by gas-liquid mixed flash zone, centrifugal, the optimal design through to various application scenarios guarantees that easily device security moves reliably.Yet; The division of these functional areas divides out for the ease of description, is comparatively speaking, and they can intersect sometimes; For example also the blade identical with centrifugal pump can be arranged in the gas-liquid mixed flash zone, these blades can extend to centrifugal always and see the district off; The blade of gas centrifugation purifying area also can extend to the gas-liquid mixed flash zone.
Above-mentioned rotary wheel device can also be used through combining forms such as a plurality of parallel connections.
In water treatment field, often need from water, remove gases such as oxygen, carbon dioxide.Adopt vacuum degassing process under lower temperature, to work, need water be heated to 100 ℃.If reach very high clearance, existing vacuum dust cather, removing carbon dioxide device all need the vavuum pump of very big flow and tall and big vacuum column, and this has influenced the economy of vacuum desorption technology to a great extent.
Extensively adopt liquid-absorbant to reclaim specific gas in chemical industry and the environment-protective process; For example, the technology that from flue gas, adopts organic amine to reclaim carbon dioxide is: adopt organic amine solution in the absorption tower, to absorb the carbon dioxide in the flue gas, the organic amine solution after absorbing is delivered to desorber through heating; In desorber, make the boiling of organic amine solution; Carbon dioxide wherein desorbs, and obtains the carbon dioxide of high concentration, can from flue gas, reclaim carbon dioxide like this.
In like manner, adopt other organic amines or sodium sulfite solution, also can absorb sulfur in smoke, the sulfur dioxide of recovery can be used for making sulfuric acid or sulphur.In chemical process, organic amine solution also is used for absorbing and volatile sour gas of desorb such as hydrogen sulfide etc.
For different concrete application scenarios, the technological principle of adsorption and desorption process is identical, and concrete parameter is then inequality.All gases has certain characteristic, will be slightly different on concrete technology.For ease of describing, this paper is that example describes with the technology that adopts the organic amine absorbent from flue gas, to reclaim sulfur dioxide, and common technological process is as shown in Figure 7.
Main flow process is: contain flue gas chilling in water scrubber 1 of sulfur dioxide, remove granule dust and most of strong acid simultaneously, get into absorption tower 2 then.In absorption tower 2, the low absorbent of sulfur dioxide concentration (afterwards being called lean solution) that contains that comes from desorption technique contacts with flue gas adverse current, and sulfur dioxide in flue gas is absorbed agent and absorbs, and flue gas after being purified is sent the flue discharging.Absorbent after the absorbing sulfur dioxide (afterwards being called rich solution) is by rich solution pump 4 pressurization, after heat exchanger 11 and hot lean solution heat exchange, gets into desorber 3 tops, in desorber 3, by steam stripped, and is hot lean solution through reboiler 6 heating desorptions.Hot lean solution is returned absorption tower 2 through lean pump 5 pressurizations through heat exchanger 11 coolers 12, and wherein a part gets into desulfating system 13 to avoid the accumulation of sulfate.The sulfur dioxide that comes out from desorber 3 cools off through condenser 8, and gas-liquid separator 9 is isolated condensed water and sulfur dioxide gas, through the further purifying of back segment, can be used as the raw material that sulfuric acid or sulphur are produced.
The advantage of existing organic amine flue gas desulfurization technique is that technological process is simpler than lime method, and system operates, safeguards simple and reliable, and the sulfur dioxide of recovery is used to make the commercial value height of sulfuric acid or sulphur; Shortcoming is once to invest greatlyyer, needs sulphur or sulfuric acid etc. to produce corollary apparatus, and the desorption technique steam consumption is bigger, and energy consumption cost is higher.
Desorber 3 in the conventional desorption technique is under the condition near atmospheric pressure, to work; Organic amine solution needs heating in the desorption technique; Also need cooling before getting back to absorption tower 2, these heating all will produce the lot of energy loss with cooling procedure, so energy consumption is than higher.
Because liquid-absorbant just can be in fluidized state under vacuum condition, so the same gas desorption of absorption that can make with common process of vacuum desorption technology comes out.The advantage of vacuum desorption is not need heating steam, and the desorption temperature of liquid-absorbant and the temperature in the absorption tower are more or less the same, so liquid-absorbant need not pass through heating and cooling procedure, and system energy consumption reduces greatly.And because liquid-absorbant is without pyroprocess, the decomposition rate of deterioration of absorbents such as organic amine wherein reduces greatly, can significantly reduce the decomposition and consumption of liquid-absorbant.
Yet; For volatile solution is arranged, organic amine solution for example is because solvent gas (like the steam) volume ratio that under vacuum state, is evaporated wants the object gas (like sulfur dioxide) of desorb much bigger; The volume flow of vavuum pump that therefore need extract these gases is big especially; Existing vavuum pump can not meet the demands when practical engineering application, and is perhaps uneconomical, therefore directly possibly not have economic advantages with vavuum pump from desorber 3 gas bleedings.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art; The present invention provides a kind of vacuum desorption method; Comprise the following steps: that (a) will be dissolved with more need the introducing within the vacuum tank by the volatile liquid of the gas of desorb (abbreviating rich solution as), form liquid phase region and gas phase zone therein; (b) gas pressure within the vacuum tank is reduced to below the saturated vapour pressure of the volatile liquid that is lower than introducing; Need the gas of desorb to overflow in a part of solvent evaporation becoming solvent vapo(u)r in the volatile liquid of introducing and the volatile liquid of introducing to become free gas to be mixed into gas phase zone, these solvent vapo(u)rs and the mixture of free gas composition are extracted out in gas phase zone; The mixture pressurization of (c) extracting out in the gas phase zone enters a sealed circuit and gives condensation therein; The operating pressure that keeps sealed circuit is greater than said saturated vapor pressure but be lower than atmospheric pressure; Solvent vapo(u)r in the said mixture is condensed into condensate liquid and emits heat; Give rich solution with liberated heat from the sealing circuit transmission, simultaneously free gas and condensate liquid are extracted out from sealed circuit.
Description of drawings
Fig. 1 is the outline perspective view of a centrifugal vacuum degasser of the present invention.
Fig. 2 is an optimization embodiment structure chart that adopts immersion oil driven by motor rotary wheel device.
Fig. 3 is the enlarged drawing of the rotary wheel device among Fig. 2.
Fig. 4 is the structure chart of another embodiment of rotary wheel device.
Fig. 5 is the structure chart of the another embodiment of rotary wheel device.
Fig. 6 is the rotary wheel device structure chart of an embodiment again.
Fig. 7 is that available technology adopting organic amine solution reclaims the sulfur dioxide process flow diagram.Wherein dotted portion representes it is flue gas preliminary treatment and absorbing process process, and solid line is partly represented the gas desorption technical process.
Fig. 8 is the sketch map of one embodiment of the invention.
Fig. 9 is the sketch map of another embodiment of the present invention.
Figure 10 is the sketch map of another embodiment of the present invention.
Figure 11 is the sketch map of another embodiment of the present invention.
Among Fig. 7-11, dotted portion representes it is flue gas preliminary treatment and absorbing process process, and solid line is partly represented the gas desorption technical process; Reference numeral 1-water scrubber wherein, the 2-absorption tower, the 3-desorber, 4-rich solution pump, the 5-lean pump, the 6-reboiler, 7-washes pump, 8-condenser, 9-gas-liquid separator, 10-reflux pump, 11-heat exchanger 12-cooler, 13-desulfating system
The specific embodiment
As shown in Figure 8; One of content of the present invention; Be through being designed with low-head vacuum gas compressor 21, condensing heat exchanger 24, high-head gas compressor vavuum pump 22; Extract the object gas such as the sulfur dioxide that are evaporated under the vacuum state out) and solvent gas (like water vapour), simultaneously supporting gas- liquid separator 9,10 pairs of solvent liquids of separating of the reflux pump water of sulfur dioxide gas (as contain) reclaim, and abbreviate secondary vacuum compression technology among this paper as.Because solvent gas concentration is very high from the gas that desorber 3 is extracted out, behind low-head vacuum gas compressor 21, a large amount of solvent gas (like water vapour) can be separated out in condensing heat exchanger 24.Low-head vacuum gas compressor 21 has the characteristics of big flow, low pressure differential, and in general its inlet outlet pressure differential can adopt centrifugal fan or Roots vaccum pump less than 10kPa, and energy consumption is lower.22 flows are much little for high-head gas compressor (or claim vavuum pump), and it can be compressed to gas more than the atmospheric pressure, can adopt multiple vavuum pump, but prior art with liquid-ring vacuum pump more suitable aspect the Technological Economy.Utilize condensing heat exchanger 24 that the heat of water vapor condensation is delivered to rich solution in the secondary vacuum compression technology; It is favourable to desorb to improve the rich solution temperature; And do not need outside Cooling and Heat Source; Therefore the advantage of secondary vacuum compression technology is to have reduced energy consumption significantly, makes the vacuum desorption technology economic advantages that when practical engineering application, possess skills.
Fig. 9 is used for the flue gas desulfurization flow chart with the vacuum desorption technology that condensing heat exchanger is arranged in the desorber.Wherein, what dot is the absorption technique part of flue gas desulfurization, and what solid line was represented is the desorption technique part.
What have superiority comparatively speaking is that condensing heat exchanger 24 is arranged on the technology in the desorber.Because condensing heat exchanger 24 is installed in desorber inside, can make the transverse tube type falling film evaporator.Through increasing the heat exchange area of condensing heat exchanger, the pressure reduction of low-head vacuum gas compressor 21 front and back is reduced, or under same energy consumption condition, can improve desorption effect.
Two of content of the present invention, be with centrifugal vacuum degassing process and secondary vacuum compression technology common application in vacuum desorption technology, shown in figure 10.This content is the further optimization that secondary vacuum compression technology is used for vacuum desorption, and its advantage is that the equipment volume of desorption technique is especially little, and can eliminate the harmful effect of issuable foam in the desorption process.
Figure 10 adopts the vacuum desorption technology of centrifugal vacuum deaerator plant to be used for the flue gas desulfurization flow chart.Wherein, The vacuum desorption part is made up of the centrifugal vacuum deaerator plant 26 that has pump, low-head vacuum gas compressor 21, high-head gas compressor (or claiming vavuum pump) 22, heat exchanger 24, gas-liquid separator 9, reflux pump 10; Representing with solid line, is content of the present invention; Remainder is a smoke absorption technology, dots.
Applicating example
The vacuum desorption technology of the centrifugal vacuum deaerator plant of employing of the present invention not only can be used for environmental protection fields such as flue gas processing; Vacuum outgas, deaeration in condenser, the vacuum removing carbon dioxide that can also be used for industry water, and the vacuum desorption technology of other desorption gas from volatile solution.
Give an example one
When adopt being equipped with centrifugal vacuum deaerator plant that a vavuum pump vacuumizes 40 ℃ water being carried out deoxidation treatment, discharge is 2m
3/ h, vacuum pump flow rate is 50m
3/ h, the water inlet dissolved oxygen content is 6mg/L, and the oxygen content of handling the back water outlet is being the 2-4mg/L scope roughly, and effect is undesirable.The theoretical analysis, the water theoretical evaporation capacity in vacuum chamber is less than 0.15%, and actual capabilities are smaller, so deaerating effect is undesirable.
After adopting technology shown in Figure 10, the theoretical evaporation capacity of water in vacuum chamber is greater than 0.5%, and the water outlet oxygen content is less than 0.5mg/L, and the oxygen clearance reaches more than 90%.
Give an example two
Adopt the technology of Fig. 9 to carry out the recycling of carbon dioxide in the flue gas.Different is, if there is not sulfur dioxide in the flue gas, does not have the oxidized problem as sulfur dioxide, does not also just have the problem of sulfate removal, can all get back to the absorption tower from the lean solution that Analytic Tower comes out.But often there is more sulfur dioxide in the actual flue gas, still need removes sulfate equistability salt.
Wherein, condensing heat exchanger 24 is installed in desorber inside, and heat-transfer surface adopts the stainless steel tube of overall diameter 25mm, adopts horizontal arrangement form slightly with angle, sidles condensed water and carbon dioxide in the pipe, and the pipe outside is an organic amine solution.In the Analytic Tower that vacuumizes; Organic amine solution flows in the pipeline outside from top to bottom; Water vapour that volatilizes and carbon dioxide are in 3-10 ℃ of the back temperature rising of pressurizeing through low-head vacuum gas compressor 21, and when flowing through the stainless steel tube inboard, the water vapour condensation becomes water (containing amounts of carbon dioxide gas); The heat that water condensation produces is delivered to the pipe outer wall, organic amine solution that can the heating tube outside.The water that condenses is realized gas-water separation through the liquor collecting system and the demister of pipe ends, can obtain containing the distilled water of carbon dioxide.The horizontal heat exchange tube of this programme not only plays the heat exchange effect, can also enlarge the gas-liquid contact area of organic amine solution stripping, and simultaneously all right by-product distilled water, and integrated artistic compact conformation are preferred versions of the present invention.
This routine design is not limited to the desorb that is used for carbon dioxide, and the gas that is difficult to resolve suction for some relatively is more suitable.
Give an example three
On the basis of Figure 10, adopt liquid-ring vacuum pump as the high-head gas compressor, further results of optimization is shown in figure 11.Because the liquid ring vacuum pump discharge of this programme can have certain pressure, being called liquid rotary compressor maybe be more accurate, and this paper still uses " liquid-ring vacuum pump " to describe.
When adopting this programme; The requirement whether fluid flow that needs consideration condensing heat exchanger comes out and temperature satisfy liquid-ring vacuum pump; Can gas-liquid separator be set at the liquid ring vacuum pump discharge in case of necessity; Isolated a part of liquid is back to the liquid ring vacuum pump intake, cooler can also be set withdrawing fluid is cooled off to satisfy the need of work of liquid-ring vacuum pump.
Specific to the flue gas desulphurization system of Figure 11, the high-head gas compressor of this programme adopts liquid-ring vacuum pump 22, can condensed water and sulfur dioxide gas be pressurized to more than the atmospheric pressure, to make things convenient for condensate return, also is convenient to the conveying of back segment sulfur dioxide gas.
Say that broadly the present invention provides a kind of vacuum desorption method, comprises the following steps:
(a) will be dissolved with more need be (for example by the volatile liquid of the gas of desorb (abbreviating rich solution as); By the rich solution pump 4 shown in Fig. 8 and 9) (for example introduce a vacuum tank; Desorber 2 shown in Fig. 8 and 9, the centrifugal vacuum deaerator plant 26 shown in Figure 10 and 11) within, liquid phase region and gas phase zone formed therein;
(b) (for example utilizing the low-head vacuum gas compressor 21 shown in Figure 81 1) is reduced to below the saturated vapour pressure of the volatile liquid that is lower than introducing the gas pressure within the vacuum tank; Need the gas of desorb to overflow in a part of solvent evaporation becoming solvent vapo(u)r in the volatile liquid of introducing and the volatile liquid of introducing to become free gas to be mixed into gas phase zone; In gas phase zone, extract the mixture of these solvent vapo(u)rs and free gas composition out (for example use the low-head vacuum gas compressor 21 shown in Fig. 8-11, the volume flow here is very big);
The mixture pressurization of (c) extracting out in the gas phase zone enters a sealed circuit (for example comprising condensing heat exchanger 24 and/or the loop of gas-liquid separator 9 shown in Fig. 8-11) and gives condensation therein; The operating pressure that keeps sealed circuit is greater than said saturated vapor pressure but be lower than atmospheric pressure; Solvent vapo(u)r in the said mixture is condensed into condensate liquid and emits heat; Give rich solution (conduct heat and not mass transfer) with liberated heat from the sealing circuit transmission, (for example use the high-head gas compressor vavuum pump 22 shown in Fig. 8-11) simultaneously free gas and condensate liquid are extracted out from sealed circuit.
Wherein, the required cooling medium of condensation need to come down to the solution of desorption gas; After desorb and the vaporized gas process low-head vacuum gas compressor pressurizes, can condensation go out a large amount of liquid fluxs, thereby reduce the volume flow of high-head gas compressor greatly in the vacuum stripper.
Better, utilize liquid-ring vacuum pump (shown in the Reference numeral 22 of Figure 11) that free gas and condensate liquid are extracted out from sealed circuit together and then carry out gas-liquid separation; Perhaps free gas and condensate liquid being carried out gas-liquid separation utilizes vavuum pump (for example using the high-head gas compressor vavuum pump 22 shown in Fig. 8-11) that isolated gas is extracted out then.Can reduce the operting differential pressure or the pressure head of the low-head vacuum gas compressor 21 shown in Fig. 8-11 thus, just reduce its live load, because its volume flow is very big.
Better, (for example utilizing the reflux pump 10 shown in Fig. 8-11) is recovered to isolated condensate liquid in the vacuum tank.
Better, said vacuum tank is provided by a centrifugal vacuum degasser.That is to say that described liquid phase region and gas phase zone are formed in the centrifugal vacuum degasser described in the background technology.
Better, step (c) also comprises: liberated heat (for example utilizing condensing heat exchanger as shown in Figure 9 24) is directly passed to the rich solution of just introducing vacuum tank.
Better, step (c) also comprises: liberated heat (for example utilizing the coiled condensing heat exchanger in the desorber as shown in Figure 8 3) is directly passed to the rich solution of introducing vacuum tank.
Best; Said vacuum tank is provided by a horizontal tube multiple effect distillator; The horizontal piping that the latter comprises that an airtight container is located in the said airtight container as said vacuum tank and one and isolates with its gas-liquid; Wherein introduce the pipe outside of the volatile liquid spray of airtight container at said horizontal piping, said sealed circuit is then provided by the pipe inboard of this horizontal piping.
Technological process of the present invention is simple, and energy consumption is low, and occupation area of equipment is little, and economic advantages are outstanding.
Claims (8)
1. a vacuum desorption method comprises the following steps:
(a) more need the introducing within the vacuum tank be will be dissolved with, liquid phase region and gas phase zone formed therein by the volatile liquid of the gas of desorb (abbreviating rich solution as);
(b) gas pressure within the vacuum tank is reduced to below the saturated vapour pressure of the volatile liquid that is lower than introducing; Need the gas of desorb to overflow in a part of solvent evaporation becoming solvent vapo(u)r in the volatile liquid of introducing and the volatile liquid of introducing to become free gas to be mixed into gas phase zone, these solvent vapo(u)rs and the mixture of free gas composition are extracted out in gas phase zone;
The mixture pressurization of (c) extracting out in the gas phase zone enters a sealed circuit and gives condensation therein; The operating pressure that keeps sealed circuit is greater than said saturated vapor pressure but be lower than atmospheric pressure; Solvent vapo(u)r in the said mixture is condensed into condensate liquid and emits heat; Give rich solution with liberated heat from the sealing circuit transmission, simultaneously free gas and condensate liquid are extracted out from sealed circuit.
2. vacuum desorption method as claimed in claim 1 is characterized in that, in step (c), utilizes liquid-ring vacuum pump that free gas and condensate liquid are extracted out from sealed circuit together and then carries out gas-liquid separation.
3. vacuum desorption method as claimed in claim 1 is characterized in that, in step (c), free gas and condensate liquid is carried out gas-liquid separation utilize vavuum pump that isolated gas is extracted out then.
4. like claim 2 or 3 described vacuum desorption methods, it is characterized in that, isolated condensate liquid is recovered in the vacuum tank.
5. like each described vacuum desorption method of claim 1-4, it is characterized in that said vacuum tank is provided by a centrifugal vacuum degasser.
6. like each described vacuum desorption method of claim 1-5, it is characterized in that step (c) also comprises: liberated heat is directly passed to the rich solution of just introducing vacuum tank.
7. like each described vacuum desorption method of claim 1-6, it is characterized in that step (c) also comprises: liberated heat is directly passed to the rich solution of introducing vacuum tank.
8. vacuum desorption method as claimed in claim 7; It is characterized in that; Said vacuum tank is provided by a horizontal tube multiple effect distillator; The latter comprise that an airtight container is located in the said airtight container as said vacuum tank and one and with the horizontal piping that its gas-liquid is isolated, wherein introduce the pipe outside of the volatile liquid spray of airtight container at said horizontal piping, said sealed circuit is then provided by the pipe inboard of this horizontal piping.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105060556A (en) * | 2015-07-31 | 2015-11-18 | 四川沃兹凯兰环保技术有限公司 | Sulfur-containing wastewater adjustable negative pressure desulphurization apparatus |
| CN105547909A (en) * | 2015-12-03 | 2016-05-04 | 浙江大学 | Preparation method of component volatile deep degassed solution and vapor pressure determination method |
| RU2716163C1 (en) * | 2019-01-22 | 2020-03-06 | Общество с ограниченной ответственностью "Научно-производственное объединение "АМБ" | Method of controlling substances in aqueous solutions |
| CN112226250A (en) * | 2020-12-15 | 2021-01-15 | 上海境业环保能源科技股份有限公司 | Coal gas multi-pollutant purification treatment system |
| CN112999702A (en) * | 2021-03-25 | 2021-06-22 | 绵阳世诺科技有限公司 | Continuous gravity film centrifugal discharge disc and application |
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| JP2005205322A (en) * | 2004-01-22 | 2005-08-04 | Nichiban Co Ltd | Defoaming apparatus |
| JP2009018211A (en) * | 2007-06-15 | 2009-01-29 | Mitsubishi Kakoki Kaisha Ltd | Treatment apparatus of livestock excretions |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105060556A (en) * | 2015-07-31 | 2015-11-18 | 四川沃兹凯兰环保技术有限公司 | Sulfur-containing wastewater adjustable negative pressure desulphurization apparatus |
| CN105547909A (en) * | 2015-12-03 | 2016-05-04 | 浙江大学 | Preparation method of component volatile deep degassed solution and vapor pressure determination method |
| CN105547909B (en) * | 2015-12-03 | 2018-01-23 | 浙江大学 | Component volatile depth de gassed solution compound method and vapour-pressure test method |
| RU2716163C1 (en) * | 2019-01-22 | 2020-03-06 | Общество с ограниченной ответственностью "Научно-производственное объединение "АМБ" | Method of controlling substances in aqueous solutions |
| CN112226250A (en) * | 2020-12-15 | 2021-01-15 | 上海境业环保能源科技股份有限公司 | Coal gas multi-pollutant purification treatment system |
| CN112999702A (en) * | 2021-03-25 | 2021-06-22 | 绵阳世诺科技有限公司 | Continuous gravity film centrifugal discharge disc and application |
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